TIME RESOLVED PHOTOACOUSTIC SPECTROSCOPY OF METASTABLE ELECTRONIC STATES OF DYE MOLECULES W.W.A. Keller, W. Schubert, R. Germer and E. Strauss J. Phys. Colloques, 44 C6 (1983) C6-397-C6-400 DOI: 10.1051/jphyscol:1983665